A041929 Denominators of continued fraction convergents to sqrt(487).

1, 14, 15, 44, 191, 235, 426, 1513, 3452, 18773, 22225, 152123, 174348, 326471, 7030239, 7356710, 14386949, 93678404, 108065353, 634005169, 1376075691, 4762232242, 6138307933, 10900540175, 49740468633, 110381477441, 160121946074, 2352088722477, 103652025735062

Offset

0,2

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..200

Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 103812147681136, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1).

Formula

a(n) = 103812147681136*a(n-28) - a(n-56) for n>55. - Vincenzo Librandi, Dec 27 2013

Mathematica

Denominator[Convergents[Sqrt[487], 30]] (* Harvey P. Dale, May 21 2013 *)

Crossrefs

Cf. A041928.

Sequence in context: A357625 A041404 A041402 * A341242 A174924 A041408

Adjacent sequences: A041926 A041927 A041928 * A041930 A041931 A041932

Keyword

nonn,cofr,frac,easy

Author

N. J. A. Sloane

Extensions

More terms from Vincenzo Librandi, Dec 27 2013

Status

approved